EP2091230A1 - Procédé, dispositif et système pour synchroniser les signaux audio/vidéo - Google Patents

Procédé, dispositif et système pour synchroniser les signaux audio/vidéo Download PDF

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Publication number
EP2091230A1
EP2091230A1 EP08002739A EP08002739A EP2091230A1 EP 2091230 A1 EP2091230 A1 EP 2091230A1 EP 08002739 A EP08002739 A EP 08002739A EP 08002739 A EP08002739 A EP 08002739A EP 2091230 A1 EP2091230 A1 EP 2091230A1
Authority
EP
European Patent Office
Prior art keywords
signal
auxiliary signal
delay
audio
transmission path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP08002739A
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German (de)
English (en)
Inventor
Wilhelm Hagg
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sony Corp
Original Assignee
Sony Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sony Corp filed Critical Sony Corp
Priority to EP08002739A priority Critical patent/EP2091230A1/fr
Priority to US12/361,013 priority patent/US8558951B2/en
Priority to CN2009101267860A priority patent/CN101510983B/zh
Publication of EP2091230A1 publication Critical patent/EP2091230A1/fr
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N17/00—Diagnosis, testing or measuring for television systems or their details

Definitions

  • An embodiment of the invention relates to a method, a device and a system for synchronizing audio/video signals.
  • a further embodiment of the invention relates to a method and device for measuring a value of a delay of a first rendering device.
  • Measuring delay values of rendering devices is a complex task that requires a sophisticated setup with microphones. This puts a huge burden on device manufacturers in terms of product qualification and quality assessment.
  • the Bluetooth standard there is a test suit available that can be installed easily on a personal computer (PC) and then run the tests. It is currently not possible to verify the correct synchronization between audio and video devices with such a setup.
  • a flowchart of a method according to an embodiment of the invention is depicted.
  • S100 a first and a second auxiliary, pulse-shaped signals are generated.
  • the pulse-shaped signals might also be referred to as clock pulse signals.
  • the first and the second auxiliary signals might be derived from a common signal, which results in an easier way to ensure a precise timing relationship between the first and the second auxiliary signal.
  • the first auxiliary signal is transmitted via a first transmission path to a first rendering device and the second auxiliary signal is transmitted via a second transmission path to a second rendering device in S102.
  • the first and/or second rendering device might render analog or digital signals and the first and second auxiliary signals might be video and/or audio signals.
  • the rendering devices might be loudspeakers, headphones, displays or any other rendering device suited to render video/audio signals.
  • a delay of the first and/or second transmission path is adjusted by synchronizing the first audio video output signal with the second audio/video output signal.
  • the transmission path might be any combination of wired and/or wireless communication path suitable to transmit the first and second auxiliary signal to the rendering device.
  • the delay is adjusted, by a user, e.g. in the case of audio signals by finding a delay at which both audio output signals from the first and the second rendering device are heard simultaneously.
  • the duration of the pulse-shaped signals is chosen to provide a sufficiently precise synchronization.
  • the delay of the first and/or second transmission path is kept for further data streams or signals that are transmitted from data or signal sources to the rendering devices.
  • the rendering devices might also be referred to as data sinks or signal sinks.
  • a device 200 for synchronizing audio/video signals is depicted.
  • the device 200 for synchronizing audio/video signals comprises a signal generator 202 configured to generate a first and a second auxiliary signal, wherein said first auxiliary signal and said second auxiliary signal are pulse-shaped.
  • the device 200 further comprises a first transmitter 204 configured to transmit said first auxiliary signal via a first transmission path 206 to a rendering device (not depicted). Further on a second transmitter 208 is provided which is configured to transmit the second auxiliary signal via a second transmission path 210 to a further rendering device (not depicted).
  • a delay unit 220 is included within the device 200, the delay unit 220 being configured to adjust a delay of said first and/or said second transmission path 210.
  • the delay of the first/second transmission path 206, 210 might be adjusted by a user until the delays on both transmission path 206, 210 might give the impression to the user that the delays are the same.
  • a block diagram of a further device 300 is depicted which comprises the first audio/video input 302 and a second audio/video input 304.
  • the first audio/video input 302 is connected via a switching unit 306 to a first transmitter 206.
  • the second audio/video input 304 is connected via the switching unit 306 and the delay unit 220 to the second transmitter 210.
  • the device 300 comprises the signal generator 202 configured to generate the first and the second auxiliary signal.
  • the signal generator is also connected to the switching unit 306.
  • the delay unit 220 is controlled via a control unit 310 which is connected to an input 312.
  • the device 300 for synchronizing audio/video signals works as follows.
  • the switching unit 306 is configured to switch between a first position that is configured to transmit the auxiliary signals generated from the signal generator 202 to the first and second transmitters 204, 208 or a second position that is configured to transmit audio/video input signals from the first audio/video input 302 and the second audio/video input 304 to the first and second transmitter 204, 208.
  • the signal generator 202 In case a user wants to synchronize the audio/video signals the signal generator 202 generates the first and the second auxiliary signals which are transmitted via the switching unit 306 to the first and second transmitter 204, 208 which transmit the auxiliary signals via the first transmission path 206 and the second transmission path 210 to corresponding first and second rendering devices.
  • a user might input feedback signals via the input 312 to the control unit 310 which adjusts the delay of delay unit 220.
  • the delay unit 220 adjusts the delay of the second transmission path 210 based on the feedback signals until a synchronization of the outputted audio/video signals from the first and second rendering devices is achieved and the user is satisfied. The satisfaction of the user might result in no further feedback signals.
  • the switching unit 306 is switched to the second position so that the audio/video signals inputted at the first audio/video input 302 and the second audio/video 304 are transmitted via the first transmission path 306 and the second transmission path 310 to the rendering devices. Since the delay unit 220 is adjusted so that the delay of the second transmission path 310 is, e.g. the same as on the first transmission path 306 the first and second audio/video signal are rendered synchronously from the first and second rendering device.
  • Fig. 4 a method for measuring a delay of the first rendering device is depicted.
  • the first auxiliary signal is transmitted via a first transmission path to a first rendering device and the second auxiliary signal is transmitted via a second transmission path to a second rendering device in S402.
  • the first and the second auxiliary signals are outputted as first and second audio/video output signals from the corresponding rendering devices in S404.
  • a user adjusts a delay of the first and/or second transmission path by synchronizing the first with the second audio/video signal in S406.
  • the delay of the first rendering device is determined by determining the delay of the second transmission path after adjusting in S408.
  • the delay of the second transmission path after adjusting is precisely known beforehand, for instance because the adjustment has been calibrated by precisely measuring the delay with a separate arrangement.
  • FIG. 5 a schematic block diagram of a system for synchronizing audio/video signals is depicted.
  • the system 500 comprises the synchronization unit 501, a first rendering device 502 coupled to said synchronization unit 501 by a first transmission path 504 and a second rendering device 510 coupled to the synchronization unit 501 via a second transmission path 512.
  • the synchronization unit 501 includes a signal generator 520 configured to generate a first and a second auxiliary signal wherein the first auxiliary signal and the second auxiliary signal are pulse-shaped.
  • the synchronization unit 501 includes a first transmitter 522 configured to transmit the first auxiliary signal via the first transmission path 504 and a second transmitter 524 configured to transmit the second auxiliary signal via a second transmission path 512. Further on the synchronization unit 501 includes a delay unit 530 configured to adjust a delay of the first transmission path 504 and/or the second transmission path 512. A user 540 can listen to outputted audio/video signals 542 and 544 and adjust the delay of the delay unit 530 until the output signals 542 and 544 are synchronized.
  • a schematic view graph of a pulse-shaped signal 600 is depicted which comprises during a time interval T1 a sinusoidal signal as an amplitude a1 and in a time interval T2 adjoining the first time interval T1 no signal.
  • a sinusoidal signal as an amplitude a1 and in a time interval T2 adjoining the first time interval T1 no signal.
  • Such a signal might be repeated several times in order to facilitate the delay adjustment.
  • the manual synchronization of a pair of rendering devices is performed by sending a clock pulse reference signal 600 to a pair of rendering devices 502, 510.
  • the signal sent to one of the devices is delayed by an artificial, adjustable delay unit 530.
  • Based on the perception of the peaks from both rendering devices 502, 510 a user 540 is able to precisely adjust the amount of the delay so that both rendering devices 502, 510 are well synchronized.
  • the synchronization method can be applied to a pair of audio devices, a pair of video devices or to an audio and a video device.
  • FIG. 7 a block diagram of a measuring device 702 in combination with the device under test 704 is depicted.
  • the measuring device 702 comprises an adjustable delay unit 706 and a signal generator 708.
  • the signal generator 708 is configured to generate a first and a second auxiliary signal, wherein said first auxiliary signal and a second auxiliary signal are pulse-shaped.
  • the signals might e.g. be referred to as clock pulse signal.
  • the measuring device 702 includes a first transmitter 710 configured to transmit the first auxiliary signal by a first transmission path 712.
  • the measuring device 702 further includes a second rendering device 714 and a second transmitter 716 configured to transmit the second auxiliary signal via a second transmission path 718 to the second rendering device 714.
  • the delay unit 706 is configured to adjust the delay of the first and/or second transmission path 712, 718.
  • a control unit 720 is provided including an input port 722, said control unit being configured to adjust the delay of the delay unit 706 based on feedback signals on the input port 722. Further on the measuring device includes an output unit 730 configured to output the delay of the measuring device 710.
  • the second rendering device 714 and the measuring device 702 which acts as a reference renderer might have a certain delay that is one source of inaccuracy.
  • a reference rendering device with a very precisely known, constant delay might be used to calibrate the measuring device.
  • the measuring device 702 might regularly update its global time base from a time server and determined the clock frequency from the global time differences within an interval defined by a number of local cycles.
  • a measuring device 702 might be realized by a personal computer (PC, laptop) by installing the software package. Audio and video rendering devices like loudspeakers or displays are usually available and the clock pulse signal as well as the adjustable delay unit 706 can be implemented in software.
  • Such a software-based measuring unit might again be calibrated by a reference rendering device 702 which could be an off-the-shelf product with a well known delay. This also allows to compensate for different delays introduced by the communication hardware and protocol stacks, as for example in a wireless data transmission between the devices.
  • the measurement of delay values might be used for product quality assurance as well as for product specification.
  • the method might also be used for high quality manual calibration of devices.
  • a first loudspeaker 802 and a second loudspeaker 804 are used as rendering devices.
  • a user 806 listens to the audio signals which are rendered from the first loudspeaker 802 and the second loudspeaker 804.
  • the pulse-shaped signals which are depicted schematically in a power-time diagram 808 might be separated by a certain time interval t3.
  • the first and second auxiliary signals are heard simultaneously, as it is depicted schematically in a power-time diagram 810.
  • a first loudspeaker 902 as a first rendering device and a display 904 as a second rendering device.
  • a bar 905 might be moved across the screen of the video device from the top to the bottom.
  • the signals are considered to be synchronized when the audio signal is sensed at the same moment when the bar 905 has a predetermined position on the screen 904.
  • the bar 905 should just be visible in the bottom region of the screen 904 when the audio signal is sensed at a predetermined time t1.
  • the pulse-shaped audio signals are respectively depicted in schematic power-time diagrams 908, 910.
  • Fig. 10 it is depicted how two displays 1002 and 1004 are synchronized by using a respective bar 1006, 1008 moving from the top to the bottom of the screen. After adjusting the delay the two bars 1006, 1008 should move simultaneously from the top to the bottom as it is depicted schematically on the right sight, after adjusted delay.
  • Other embodiments e.g. using flashed images which should flash simultaneously or displaying a curve of an audio signal on a video screen might be used as well for synchronizing two video signals.
  • this method could be used to calibrate surround systems or for audio/video synchronization.
  • the adjustment might be implemented by utilizing a standard infrared remote controlling which is coupled to the input of the control unit.
  • the method allows for simple synchronization of audio and/or video rendering devices and allows the measurement of delay values of rendering devices for verification purposes.
  • the method is based on sending a clock pulse signal to a pair of devices combined with an adjustment of an artificial delay introduced to one of the signals.
  • the adjustment is performed by a user and is based on the evaluation of simultaneous perception of both signals.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Television Receiver Circuits (AREA)
EP08002739A 2008-02-14 2008-02-14 Procédé, dispositif et système pour synchroniser les signaux audio/vidéo Withdrawn EP2091230A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP08002739A EP2091230A1 (fr) 2008-02-14 2008-02-14 Procédé, dispositif et système pour synchroniser les signaux audio/vidéo
US12/361,013 US8558951B2 (en) 2008-02-14 2009-01-28 Method, device and system for synchronizing audio/video signals
CN2009101267860A CN101510983B (zh) 2008-02-14 2009-02-13 用于同步音频/视频信号的方法、设备和系统

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP08002739A EP2091230A1 (fr) 2008-02-14 2008-02-14 Procédé, dispositif et système pour synchroniser les signaux audio/vidéo

Publications (1)

Publication Number Publication Date
EP2091230A1 true EP2091230A1 (fr) 2009-08-19

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EP08002739A Withdrawn EP2091230A1 (fr) 2008-02-14 2008-02-14 Procédé, dispositif et système pour synchroniser les signaux audio/vidéo

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EP (1) EP2091230A1 (fr)
CN (1) CN101510983B (fr)

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US8965026B2 (en) * 2011-06-10 2015-02-24 Canopy Co. Method and apparatus for remote capture of audio in a handheld device
US8988489B2 (en) 2010-09-15 2015-03-24 Hewlett-Packard Development Company, L. P. Determining a synchronization relationship
US8878894B2 (en) 2010-09-15 2014-11-04 Hewlett-Packard Development Company, L.P. Estimating video cross-talk
CN102143376B (zh) * 2010-11-29 2013-05-22 北大方正集团有限公司 一种双路视频信号一致性检测的方法及装置
US8935574B2 (en) * 2011-12-16 2015-01-13 Advanced Micro Devices, Inc. Correlating traces in a computing system
US9516262B2 (en) * 2012-05-07 2016-12-06 Comigo Ltd. System and methods for managing telephonic communications
US8832500B2 (en) 2012-08-10 2014-09-09 Advanced Micro Devices, Inc. Multiple clock domain tracing
US8959398B2 (en) 2012-08-16 2015-02-17 Advanced Micro Devices, Inc. Multiple clock domain debug capability
BR112015004056A2 (pt) * 2012-08-28 2017-07-04 Koninklijke Philips Nv dispositivo de fornecimento de áudio; visor; sistema de áudio e vídeo; método de fornecimento de áudio; e programa de computador
CN103139289A (zh) * 2013-01-21 2013-06-05 西安建艺设计制作策划有限公司 同步演示方法及演示系统
US9712266B2 (en) 2013-05-21 2017-07-18 Apple Inc. Synchronization of multi-channel audio communicated over bluetooth low energy
CN107135413A (zh) * 2017-03-20 2017-09-05 福建天泉教育科技有限公司 一种音视频同步方法及系统
CN109144642B (zh) * 2018-08-14 2022-02-18 Oppo广东移动通信有限公司 显示控制方法、装置、电子设备及存储介质

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US20070220561A1 (en) * 2006-03-20 2007-09-20 Girardeau James W Jr Multiple path audio video synchronization

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WO2006008696A1 (fr) * 2004-07-15 2006-01-26 Koninklijke Philips Electronics N.V. Systeme de mesure de retard entre deux signaux transmis par deux voies de transmission
US20060127053A1 (en) * 2004-12-15 2006-06-15 Hee-Soo Lee Method and apparatus to automatically adjust audio and video synchronization
EP1720339A2 (fr) * 2005-05-04 2006-11-08 Pace Micro Technology PLC Système de télévision
US20070220561A1 (en) * 2006-03-20 2007-09-20 Girardeau James W Jr Multiple path audio video synchronization

Also Published As

Publication number Publication date
US8558951B2 (en) 2013-10-15
CN101510983A (zh) 2009-08-19
CN101510983B (zh) 2012-09-12
US20090207306A1 (en) 2009-08-20

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